EUROCONTROL Specification for European Mode S Station (EMS)

This document provides specification for a Mode S ground station used for Surveillance functions.

The station detailed in this document provides Elementary and Enhanced Surveillance Services to ATC through use of Mode S Specific Services, particularly Ground Initiated Comm-B and Mode S Comm-B Broadcast, and Mode S  Extended Squitters (ADS-B).

Mode S ground stations compliant with this specification support performance, secondary surveillance radar transponders and exchange of surveillance data as referred in the European Commission Implementing Regulation (EU) No 1207/2011 of 22 November 2011 as amended by (EU) No 1028/2014 of 26 September 2014, (EU) 2017/386 of 6 March 2017 and (EU) 2020/587 of 29 April 2020. Mode S ground stations that meet this specification can be used to support aircraft separation applications.

The stations defined in this document have interfaces to work in a cooperative way with other surveillance systems. This edition includes new functions to decrease the Mode S interrogations and to optimize the use of the 1 030/1 090 MHz frequency band


EUROCONTROL Specification for European Mode S Station (EMS) - Edition 4.0
EUROCONTROL Specification for European Mode S Station (EMS) - Consultation supporting material for edition 4.0
European Mode S station functional specification - Edition 3.11